I have a Stingray 5 and often use it in parallel mode - it produces the classic Stingray sound like that - the series setting gives the mids a bump and sounds more towards a Fender sound IMO.Which begs the next question: "Those who HAVE the series/parallel option, which side do you generally stick with?"
My #1 has been a G&L L2K for 18 years now and I almost never switch to parallel.
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Stingray 5s, whether ceramic or alnico and U.S. Sterlings - all with single H pick up have the switch - it's give three distinct variants which in combination with your finger placement and intensity and the 3 band EQ makes for a very versatile bass.
Gratuitous photo .........